From a page move: This is a redirect from a page that has been moved (renamed). This page was kept as a redirect to avoid breaking links, both internal and external, that may have been made to the old page name.
From a synonym: This is a redirect from a semantic synonym of the target page title.
From British English: This is a redirect from a term in British English spelling to an alternative spelling variation. The spelling is given by the target of the redirect.